Blender Scripting: ERROR: too much data in this layer, compared to elements in mesh, skipping!
This error handling was originally introduced in commit rBAde7d0111100f as a fix for T43718. This issue appears to be that the file contains more entries in the FBX layer data than there are elements of e.g. vertices, edges, polygons or polyloops. If the handling of the FBX importer is correct, then this is an improperly written FBX file. Blender will try to skip the wrongly formatted data.
You should check if CLO has released an update that fixes the issue and if not, export to a different format. If they provide a way to report bugs I would suggest you contact them so that they are aware of the issue.